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STMicroelectronics STP2CMPQTR
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- Part No.:
- STP2CMPQTR
- Manufacturer:
- STMicroelectronics
- Category:
- LED Drivers
- Package:
- 20-UFQFN
- Datasheet:
-
STP2CMPQTR.pdf
- Description:
- IC LED DRVR RGLTR PWM 30MA 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,672
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Product details
Overview
STP2CMPQTR from STMicroelectronics is a low-voltage, 2-channel constant-current LED driver with integrated charge pump. It operates from 2.7 V to 5.5 V, delivers up to 30 mA per channel with ±7% absolute current accuracy and ±4% channel-to-channel mismatch, and supports LED forward voltages up to 3.8 V. It is designed for mobile phone display backlighting.
For engineers reviewing the STP2CMPQTR datasheet, STP2CMPQTR pinout, STP2CMPQTR application, or STP2CMPQTR equivalent, key selection criteria include programmable per-channel current via external resistors, independent ON/EN control, charge pump enable/disable via CP_SEL, thermal shutdown at 150 °C, and QFN20 (1.8×3.2 mm) footprint compatibility.
Technical Context
The STP2CMPQTR uses a regulated charge pump to generate a clamped 5 V output (typ.) for driving LEDs when VCC ≥ 3.1 V and total IOUT ≤ 120 mA; at lower VCC (2.7–3.1 V), max IOUT drops to 40 mA. Its dual current sinks are independently controlled by active-high ON1/ON2 pins, each programmable via dedicated ISETx resistors using RSET = 16 × (1.22 / ILED).
Internal thermal protection shuts down the device at ~150 °C with 15 °C hysteresis. The EN pin provides global shutdown (≤5 µA quiescent), while CP_SEL selects between charge pump enabled (VOUT regulated) or disabled (VOUT = VCC), enabling flexible operation across varying LED VF and supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 5.5 V - supports single-cell Li-ion/Li-poly and 3.3 V/5 V system rails without external LDO. |
| Max Output Current | 30 mA per channel - sufficient for driving small RGB indicators or monochrome LCD backlights. |
| Current Accuracy | ±7% absolute, ±4% channel mismatch - ensures consistent brightness across dual LEDs without calibration. |
| Charge Pump Clamp | 5 V (typ.) - provides fixed headroom to drive LEDs with VF up to 3.8 V from low-input supplies. |
| PWM Control Min Pulse | 33 µs ON/OFF time - enables high-frequency dimming (>15 kHz) to eliminate audible noise. |
| Thermal Shutdown | 150 °C with 15 °C hysteresis - protects against sustained overloads or PCB thermal congestion. |
| Shutdown Current | ≤5 µA - meets ultra-low-power requirements during display off or sleep modes. |
Pinout & Package
STP2CMPQTR is housed in a compact QFN20 package (1.8 mm × 3.2 mm, 0.4 mm pitch) with exposed thermal pad for enhanced power dissipation. Pin 1 is top-left corner (marked), and pins 10 and 20 are GND - critical for low-impedance grounding and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ON1, ON2 | Active-high LED channel enable | Direct PWM interface; no external logic required - simplifies microcontroller GPIO usage. |
| EN | Global device enable | Pulls device into <5 µA shutdown; internal 300 kΩ pull-down eliminates need for external resistor. |
| ISET1, ISET2 | Current-setting reference input | Connects to ground via precision resistor to set ILED per channel using RSET = 16 × (1.22 / ILED). |
| CP_SEL | Charge pump mode control | High = enable regulated 5 V VOUT; low = bypass to VCC - adapts to LED VF and efficiency trade-offs. |
| VOUT | Charge pump regulated output | Supplies both LED channels; must be decoupled with ≥10 µF ceramic capacitor near pin. |
| C1P, C1N | Charge pump bucket capacitor terminals | Requires low-ESR 1 µF ceramic capacitor placed adjacent to minimize loop inductance and ripple. |
| LED1, LED2 | Current sink outputs | Each sinks programmed current to cathode of connected LED; anodes tied to VOUT or other bias rail. |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual-channel control | ON1/ON2 allow asynchronous on/off or PWM dimming per LED - essential for RGB sequencing or dual-display zones. |
| Programmable current per channel | Two separate ISET pins accept different RSET values - enables asymmetric brightness (e.g., main + status backlight). |
| Configurable charge pump | CP_SEL pin lets designers choose between regulated 5 V (for high-VF LEDs) or direct VCC drive (for higher efficiency at low VF). |
| Integrated thermal protection | Auto-shutdown at 150 °C with hysteresis prevents damage during transient overloads or poor heatsinking. |
| Small-footprint QFN20 | 1.8 × 3.2 mm body with 0.4 mm pitch - fits tight mobile PCB layouts while maintaining thermal pad for 70 °C/W RthJA. |
Applications
| Mobile Phone Backlighting | Smartwatch Display Illumination |
|---|---|
Use Scenario: Driving white LEDs behind small LCD panels in smartphones with battery voltage ranging from 4.2 V (fresh) to 3.0 V (discharged). IC Role / Device Role / Timing Role: Constant-current sink providing stable luminance despite supply droop; charge pump maintains 5 V headroom as battery depletes. Use Value: Eliminates need for boost converter IC or discrete FET+inductor, reducing BOM count and board area by >30% versus inductive solutions. | Use Scenario: Powering dual-color (e.g., red/green) indicator LEDs on wearable device bezels with strict height and thermal constraints. IC Role / Device Role / Timing Role: Dual independent current sink enabling color mixing or status signaling via synchronized/asynchronous PWM on ON1/ON2. Use Value: Achieves ±4% channel matching for precise color balance; QFN20 footprint allows placement under curved glass or within narrow frame zones. |
| Portable Medical Device UI | Industrial Handheld Scanner Display |
Use Scenario: Illuminating segmented OLED or monochrome LCD in battery-powered diagnostic tools requiring long runtime and reliability. IC Role / Device Role / Timing Role: Low-quiescent (≤5 µA shutdown) LED driver with thermal cutoff - ensures safe operation during extended use or ambient temperature spikes. Use Value: Meets IEC 60601 leakage and thermal safety margins; ±7% current accuracy guarantees consistent visual feedback across product lifetime. | Use Scenario: Backlighting ruggedized LCD in warehouse scanners subject to vibration, wide temperature (-20 °C to 70 °C), and intermittent power. IC Role / Device Role / Timing Role: Robust charge-pump LED driver supporting 2.7–5.5 V input and 3.8 V LED VF - tolerates brownouts and cold-start conditions. Use Value: No inductor means immunity to mechanical shock-induced EMI; QFN20 package withstands reflow and thermal cycling per IPC-J-STD-020. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2-channel constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC59282RTJR | 16-bit I²C-controlled constant-current sink; no integrated charge pump; requires external 5 V rail. | Used in systems with existing 5 V supply and need for digital brightness control; not suitable for direct battery operation below 3.3 V. | Select when centralized I²C control, higher channel count, or precise digital dimming outweighs need for charge pump integration. |
| MAX1993EUP+ | 2-channel charge-pump LED driver with 30 mA/channel; includes built-in PWM generator and fault reporting (open/short LED detection). | Preferred in designs requiring autonomous dimming or LED health monitoring without MCU intervention. | Select when system-level diagnostics or reduced firmware overhead justify higher cost and larger TSSOP-20 package. |
Compared with TLC59282RTJR and MAX1993EUP+, STP2CMPQTR offers simpler GPIO-based control, smallest footprint (QFN20 vs TSSOP-20 or QFN32), and lowest BOM dependency - ideal for space-constrained, cost-sensitive, battery-operated displays where analog current setting suffices.
Availability
STP2CMPQTR is available at Aetrix Electronics and suitable for mobile phone backlighting, smartwatch display illumination, portable medical device UI, and industrial handheld scanner display requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for STP2CMPQTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MEMS, power, and microcontroller products for automotive, industrial, and consumer markets.
The STP2CMP belongs to ST's LED driver product line, engineered specifically for low-voltage, space-constrained portable displays - emphasizing minimal external components, thermal robustness, and seamless integration with battery-powered user interfaces.
FAQ
What is the minimum PWM frequency supported for brightness control on STP2CMPQTR?
The STP2CMPQTR supports PWM dimming with minimum ON and OFF times of 33 µs each, corresponding to a maximum practical frequency of ~15.15 kHz. This avoids audible noise while ensuring full current regulation per cycle. Operation below this limit may cause visible flicker or incomplete current settling.
Can STP2CMPQTR drive LEDs with forward voltage above 3.8 V?
No - the datasheet specifies a maximum supported LED forward voltage of 3.8 V. At VCC ≥ 3.1 V, the charge pump regulates VOUT to ~5 V, giving only 1.2 V headroom. Driving higher-VF LEDs risks insufficient compliance voltage, leading to current droop or dropout. For >3.8 V LEDs, a boost-based driver is required.
How does CP_SEL affect efficiency and thermal performance?
When CP_SEL = low, the charge pump is disabled and VOUT connects directly to VCC - improving efficiency by eliminating switching losses, especially at high VCC (>4.0 V) and low LED VF. When CP_SEL = high, the charge pump adds ~10–15% conduction loss but enables operation at low VCC (e.g., 2.8 V) with adequate headroom, increasing junction temperature under load.
Is the thermal pad on the QFN20 package electrically connected?
Yes - the exposed thermal pad on the STP2CMPQTR QFN20 package is internally connected to GND (pins 10 and 20). It must be soldered to a PCB copper pour tied to the system ground plane to ensure both thermal dissipation (RthJA = 70 °C/W) and electrical stability. Floating or unconnected pads degrade thermal performance and may cause malfunction.
STP2CMPQTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 20-UFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 2
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 6V
- Current - Output / Channel:
- 30mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3.2x1.8)
STP2CMPQTR FAQ
1.How can I place an order for STP2CMPQTR through Aetrix?
Please submit a Request for Quotation (RFQ) for STP2CMPQTR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STP2CMPQTR reliable?
The price and inventory of STP2CMPQTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STP2CMPQTR is usually 5 days.
3.What payment methods are accepted for STP2CMPQTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STP2CMPQTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STP2CMPQTR?
STP2CMPQTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STP2CMPQTR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STP2CMPQTR?
For technical support, including STP2CMPQTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STP2CMPQTR requirements.
6.How does Aetrix verify that STP2CMPQTR is sourced from the original manufacturer or authorized distributors?
All STP2CMPQTR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STP2CMPQTR meets industry standards.
7.What is the process for return or replacement of STP2CMPQTR?
All STP2CMPQTR units undergo pre-shipment inspection (PSI). If there is an issue with STP2CMPQTR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STP2CMPQTR part is unused and in its original packaging.
Return procedure for STP2CMPQTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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